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Encyclopedia > Brodmann area 8

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Image File history File links Ba8. ...


Human

Brodmann area 8, or BA8, is part of the frontal cortex in the human brain. Situated just anterior to the premotor cortex (BA6), it includes the frontal eye fields (so-named because they are believed to play an important role in the control of eye movements). The frontal lobe is an area in the brain of vertebrates. ... Location of the Cerebral cortex Slice of the Cerebral cortex, ca. ... The human brain. ... Categories: Stub | Cerebrum ...


Guenon

The term Brodmann area 8 refers to a cytoarchitecturally defined portion of the frontal lobe of the guenon. Located rostral to the arcuate sulcus, it was not considered by Brodmann-1909 to be topographically homologous to the intermediate frontal area 8 of the human. Distinctive features (Brodmann-1905): compared to Brodmann area 6-1909, area 8 has a diffuse but clearly present internal granular layer (IV); sublayer 3b of the external pyramidal layer (III) has densely distributed medium sized pyramidal cells; the internal pyramidal layer (V) has larger ganglion cells densely distributed with some granule cells interspersed; the external granular layer (II) is denser and broader; cell layers are more distinct; the abundance of cells is somewhat greater. The area is involved in the managment of uncertainty. A functional magnetic resonance imaging study demonstrated that that brodmann area 8 activation occurs when test subjects experience uncertainty, and that with increasing uncertainty there is increasing activation. (Brain Res Bull. 2005 Nov 15;67(5):403-12. Epub 2005 Jul 7. Variants of uncertainty in decision-making and their neural correlates.Volz KG, Schubotz RI, von Cramon DY.) An alternative interpretation is that this activation in frontal cortex encodes hope, a higher-order expectation positively correlated with uncertainty (Chew and Ho, J Risk and Uncertainty 8(3):267-288. 1994). Type species Simia diana Linnaeus, 1758 Species see text The guenons are the genus Cercopithecus of Old World monkeys. ... Two or more structures are said to be homologous if they are alike because of shared ancestry. ... Categories: Stub | Cerebrum ... Figure 1a: A human brain, with the cerebellum in purple. ... A pyramidal cell is a multipolar neuron located in the hippocampus and cerebral cortex. ... A ganglion cell (or sometimes called a gangliocyte) is a type of neuron located in the retina that receives visual information from photoreceptors via various intermediate cells such as bipolar cells, amacrine cells, and horizontal cells. ... In neuroscience, granule cells are tiny cells found within the granular layer of the cerebellum. ...


External links

  • For Neuroanatomy of this area visit BrainInfo

See also


 
 

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